Remove unused variables

src/effects/backgroundcontrast/contrast.cpp

@@ -357,8 +357,6 @@ void ContrastEffect::prePaintWindow(EffectWindow* w, WindowPrePaintData& data, s
         return;
     }
 
-    const QRegion oldPaint = data.paint;
-
     // we don't have to blur a region we don't see
     m_currentContrast -= data.clip;
     // if we have to paint a non-opaque part of this window that intersects with the

src/kcmkwin/kwintabbox/kwintabboxconfigform.cpp

@@ -250,7 +250,6 @@ void KWinTabBoxConfigForm::loadShortcuts()
 
 void KWinTabBoxConfigForm::resetShortcuts()
 {
-    QString action;
     auto resetShortcut = [this](KKeySequenceWidget *widget, const QKeySequence &sequence = QKeySequence()) {
         const QString action = widget->property("shortcutAction").toString();
         QAction *a = m_actionCollection->action(action);